Specifications

Schneider Electric

Implementation guidelines (continued)

Principal cabling rules

b Work with pairs for digital or analogue signals.

Inside cabinets, be careful with cabling that uses separate conductors.

Identify wires by type of signal and by pair.

Special case: Emergency Off and alarm connections should never be cabled using

point-to-point single wires; always use pairs.

b Use shielded cables or double-shielded strands.

b The use of conducting raceways provides a satisfactory level of protection in most

cases. Be sure to provide inter- or intra-building connecting cables with at least

equipotential bonding (small earthing cable or raceway).

b Systematically clamp all interconnection cables against the sheetmetal inside

cabinets and machines.

For proper protection, the following ratio should be respected:

b Keep relay, variable speed drive and power circuits separate from analogue, digital

and telecommunications pairs.

b Use a special trunking inside cabinets for power cables.

Separate power cables from data cables when installing variable speed

drives.

Rule no. 1:

The outgoing and incoming conductors

should always remain together.

Rule no. 2:

All cables should be clamped against the

equipotential bonding structures to provide

high frequency protection.

E52300

Distance between cables

Radius of the largest cable

-----------------------------------------------------------------------5>

d / R > 5

Signal cable

Interfering cable

Rule no. 3:

Only pairs carrying analogue, digital and

telecommunications signals can be run

side by side in the same bundle or pulled

into the same group.

Cabling Guidelines